Electric outlet-box.



PATEXTED AUG. 11, 1908.

C. J. DORFF. JTRIC OUTLET BOX.

APPLICATION FILED JUNE 2z, 1901.

ELE

uNiTED sTATEs PATENT oEEi'oE;

I \.`v CONRAD J. DRFF, OF CHICAGO. llllil-Uls. GNOR T() FREDERGHEER, OpCHICAGO,

ILLI X015.

.ELECTRIC OUTLET-BOX.

inclusive,

:0 in accordance with this invention.

will be enlarged after e Specifics-.tion of Letters Patent.

Patented Aug. 11, 1008.

Appiicauon fixed rune s2'. iso?. sensi No. 330,190.

To alli/:hom it may cof/10cm:

Be. it known that l, 'oxnxn J. Dour?, :i

cago, in the county of Cook and Stute of Illi- E 5 nois, hav

Improvements in Electric Outlet-Boxes, 0E which the following is aspecification.

The object of this invention is the production of an improved means forclosing oper i0 ings, such as the conduit-receiving openings of electricoutlet boxes.

In the accompanying drawings, Figure' 1 is i side eleif'iition ofzin-outlet box embodying the features otiny invention. Figs. 2 to 5,

manufacture of an outlet box einbodjsiinr the features of my invention."views from opposite sides lof a section of outlet-box wall havinprtherein an opening closed Fig. S is a sectional view on dotted line 8 Sof Fig. 6.

the box or other article is built, I employ a punch 1 und a die 2, saiddie having an opei1- ing.r 3 therein, the upper end of the wallssurrounding; said o iening being beveled, as indicated at 4. 'llie punch1 is made tapering, being larger at its upper end than at its lower,whereby `tlie opening formed by the. punch punched troni the blank. Wien the punch 1 is driven through a, blank 5 lying,r over the opening 3in the die .2 a slug,f 6 having an aniiuliir flange or lin 7 thereonwill be punched froni tho blank, and an openizn:r S foi-ined in i,

said blank. '.l`lie portions of the iiietal lying over the beveledsurface et ofthe die .2 are car- Figs. Gand i are lug has been invent-edcertain new' and useful illustrate various steps in the 't i i l l rieddownward with the punch into Contact with said. beveled surface, thusforming n.

llange or liii 9 upon the edge of the'undcr l 'opposite net-ted seiderts are practically cold-welded v h together. "he, die 12 illustratedin said figcitizen ofthe United States, residingr at (.'hig ures has-aseat therein for the slug 6 and the tin t), trwo teeth 13 projectinginto seid seat ironi t-lie side walls thereof at'. diametricallyoint-s.- The punch 1l. has tivo studs 15 t iereon. When the punch 14descends, the studs 15 indent the fin 7, forcing portions thereof intothe Wall `of the opening At the same time the fin 9 is indented by theteeth 13 and iortions of said fin forced into the slurf 6. 'l`he pairs.of indented portions 1() and 1 1 are on o posite sides of theoutlet-box wall, and are iierein 4shown as arranged et right angles witheach other.

It will be, observed that the slug 6, when replaced in its opening, ispositively secured therein bythe indented portions 10 and 11 of the fins7 and 9, respectively. By

making the slug smaller than its opening I i y A y eliminate. friet-ionas a securing ineens, there- In forming: openings 1n the nietal of whichby securing a more relizible fastening and one the strength of which ispractically invariable. It has been ft. ind that where the slug issubstantially the saine size iis its opening the friction varies inxiinount. and in elliciency as a securing ineans, it depending upon thecondition of the dies, method of operating, ete.

While the slug is securely held in its oponing so es not to beshaken'therefroin by the rough luindlin, f1r to which outlet boxes are-likely to be subjected during installation,

said slug` muy be readily driven froin its opening with a hainnier orother suitable tool when the opening,r is to be used.

I desire it to be understood that in the pract ical manufacture of thisdevice I do not regard myself as limited to the precise conside. oftheblank immediately surrounding the opening 8.

To close the opening 8 until such time as itis to be used, l place theslug G therein, and i in order to secure the slug in its opening,

portions l() of the. tin 7 upon said s ug are oreed into the wall of theooening-S. and,

the fin t) are sunk into the. edge oi' the slug, by 3 au any suitablemeans, as, for example, the;

struct-ion herein described, inasmuch as many i'epart-ures freni saidconstruction may be malle within the scope of the invention.

l claim r-.s my invention:

1. An outlet-box wall having :i flanged :'pr-iiinpr therein, and aiieripheridlv llanged slug iii said opening, the flanges on said wall i:andsaidslugextendingin oppositedirections, similarly, portions 11 otsulteole points upon tools shown in Fier. 5. Atthe four mints? where thewall. und the slug are thus con- :i portion of the llaiige. on said.slug heini;` pressed into the oiillet'box wall, :ind a poriioii of thelliinge surrounding seid opening iwi-ng pressed into said slug.

2. An outlet box well having en opening thm-ein; :1. flange surroundingsaid 0 ening l indented into the slug at two diamebrcally on one facu ofsaid wall; a slug in sai opn.- opposite points. ing: a Mango on saidslug extending oppositcly tu the Runge on the wall, the flange on theslug Ming pressed und indented inta the Wall at two dinlnetricnllyopposite point-s, and the lnnge on the wall being pressed and 'CONRAD J.DORFF.

"itnessesz L. L. MlLLER, A GEORGE L. CHINDHL. v

